For carrying your music device, mobile phone or car key, this armband fits comfortably and securely without compressing, and includes reflective details for added night time safety. Sensifit Belt. Adjustable Velcro Armband. 1 Media/Key Pocket. Weight: 2.8 oz / 80 g 70D Ripstop PA Pu Elastic Power Mesh 3D Mesh Fast Wicking Fabrics Elastic Jersey.